A telephone survey uses a random digit dialing machine to call subjects. The random digit dialing machine is expected to reach a live person 25% of the time. Let X be number of success in ten attempts. What is the probability of achieving at least one successful call? HINT: first find Pr (X=0) and note that Pr (X ≥ 1) = 1 - Pr (X=0) Binomial probability formula: Pr (X=x) = nCx px qn-x where q=1-p 0.944 0.984 0.90 0.844

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